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First ionisation potential of C- atom is...

First ionisation potential of C- atom is greater than that of B atom , where as the revers is true is for second ionisation potential.

Text Solution

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Electron configuration of carbon
`(Z=6)1s^(2)2s^(2)2p^(2)`
Electron configuration of boron
`(Z=5)1s^(2)2s^(2)2p^(1)`
The size of a carbon atom is smaller than boron. So the valence electron of carbon has greater nuclear charge than that of boron. Hence the first I . E of carbon is greater than that of boron.
However, the second ionization enthalpy of boron is higher than that of carbon . This because after losing 1 electron, Boron has a full filled orbital `(2s^(2))` than carbon `(2p^(1))` Fully filled orbitals have more stability than partially filled orbitals so greater amount of energy will be needed to remove an electron from boron . So in this case, the second I. E of boron is higher than that of carbon .
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